{"id":297,"date":"2020-05-13T11:30:42","date_gmt":"2020-05-13T14:30:42","guid":{"rendered":"http:\/\/desarrollo-agil.ml\/blog\/?p=297"},"modified":"2020-05-13T11:27:19","modified_gmt":"2020-05-13T14:27:19","slug":"data-class-en-kotlin","status":"publish","type":"post","link":"http:\/\/52.201.184.187\/blog\/kotlin\/data-class-en-kotlin\/","title":{"rendered":"Data Class en Kotlin"},"content":{"rendered":"\n

Si est\u00e1s empezando con Kotlin, una de las caracter\u00edsticas que m\u00e1s van a ayudarte a escribir mejor c\u00f3digo son las data class.<\/p>\n\n\n\n

\u00bfQu\u00e9 es una data class?<\/h2>\n\n\n\n

La data class es un tipo especial de clase que se suele usar en programaci\u00f3n orientada a objetos para almacenar y\/o traspasar datos entre m\u00e9todos o capas de la aplicaci\u00f3n. Se caracteriza por solamente tener atributos y m\u00e9todos de acceso (setters y getters)<\/p>\n\n\n\n

\u00bfQu\u00e9 beneficio me da usar una data class?<\/h2>\n\n\n\n

En programaci\u00f3n \u00faltimamente se habla mucho del concepto de inmutabilidad<\/strong>. En t\u00e9rminos simples, aplicar inmutabilidad en nuestro c\u00f3digo significa concentrarnos en no modificar par\u00e1metros de entrada, sino retornar siempre copias nuevas con las modificaciones. En espa\u00f1ol, no usar setters<\/strong>, sino solamente los getters<\/strong> y hacer siempre new<\/strong>. Cuando queremos modificar algo, tenemos que hacer una copia de nuestro objeto, y retornar esa copia. Para esto, es vital implementar el m\u00e9todo copy<\/strong>. Las data class en Kotlin ya traen implementado ese m\u00e9todo, no hay que hacerlo manualmente.<\/p>\n\n\n\n

\u00bfC\u00f3mo declaro una data class en Kotlin?<\/h2>\n\n\n\n

Agregando el prefijo \u00abdata\u00bb a la definici\u00f3n de la clase. Vamos a verlo en contexto con un ejemplo:<\/p>\n\n\n\n

data class Persona(val nombre: String, val apellido: String)<\/pre>\n\n\n\n
Se debe crear el constructor de la clase, con los atributos que va a tener, indicando el tipo de cada uno. Luego, podr\u00edamos tener algo como lo siguiente:<\/p>\n\n\n\n
val jose = Persona(\"jose\", \"Perez\")\nval pedro = Persona(\"Pedro\", \"Gonzalez\")\n\njose == jose\njose == pedro<\/pre>\n\n\n\n
Si quisi\u00e9ramos, podr\u00edamos declarar una funci\u00f3n que aplique inmutabilidad:<\/p>\n\n\n\n
fun doMagic(persona: Persona): Persona {\n  return persona.copy(nombre = \"${persona.nombre}lito\")\n}\n\nval magia = doMagic(jose)\njose == magia<\/pre>\n\n\n\n
Notemos que escribiendo el c\u00f3digo de esta manera, nos aseguramos que \u00abjose\u00bb est\u00e1 exactamente igual antes de entrar al m\u00e9todo que luego de salir del mismo<\/p>\n\n\n\n
En resumen<\/h2>\n\n\n\n
Usando las data class en kotlin podemos ejercitar el \u00ab==\u00bb y aplicar el copy, y de esta manera facilitarnos la creaci\u00f3n de c\u00f3digo inmutable. Eso es un gran beneficio a la hora de leer nuestro c\u00f3digo, y nos asegura que no vamos a pasar por alto mutaciones que pueda sufrir nuestro objeto dentro de m\u00e9todos.<\/p>\n\n\n\n
Si quieren leer m\u00e1s acerca de las data class en kotlin, pueden ver la documentaci\u00f3n oficial<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Si est\u00e1s empezando con Kotlin, una de las caracter\u00edsticas que m\u00e1s van a ayudarte a escribir mejor c\u00f3digo son las data class. \u00bfQu\u00e9 es una data class? La data class es un tipo especial de clase que se suele usar en programaci\u00f3n orientada a objetos para almacenar y\/o traspasar datos entre m\u00e9todos o capas de\u2026 Leer m\u00e1s »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13,38],"tags":[93,95,36],"yoast_head":"\nData Class en Kotlin - Desarrollo \u00c1gil<\/title>\n<meta name=\"description\" content=\"Breve introducci\u00f3n y ejemplo de uso de las data class en Kotlin. \u00bfQu\u00e9 es una data class en Kotlin? \u00bfC\u00f3mo se usa? \u00bfPara qu\u00e9 nos sirve?\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/52.201.184.187\/blog\/kotlin\/data-class-en-kotlin\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Data Class en Kotlin - Desarrollo \u00c1gil\" \/>\n<meta property=\"og:description\" content=\"Breve introducci\u00f3n y ejemplo de uso de las data class en Kotlin. \u00bfQu\u00e9 es una data class en Kotlin? 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